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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc0394dcef4a6fbc4d5e4f42e77a23a2b47e2178d75c24ec3875bcafded7e7b3' 
  AND token = 'WBmXRdqYV+Zf66rpSriVzvFkYcCMon+fbLd9KOq/w+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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