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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f593b9b9a6711c17a8951365b36997d79bb08debdb1f0643a74c1716ffa3b0' 
  AND token = 'O7BY3q+pesEsQ22pzDkSuxcT0Wu7kxLIPtMPXTzHKgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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