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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14aaed03c2a4f8a9fc736c3c357678f6775e6bba5b303e12148699efe75a864f' 
  AND token = '+77Ig1BIO5FgOXl5KiQOFku+Ar+bq+TTzfInX+tAYYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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