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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa6abcde1951fb5d65779cad4a124071985983cd3c08f2a18f55feadcaacbbab' 
  AND token = 'aL6N69HYujuevMD1v2DhK0zlOlNldV6l7hOl5r3wCRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}