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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '527c54e6eaf071e79d66c93e6aa3f007e1ed0cae2c88709c25afeabca3f5cd18' 
  AND token = 'pvv6sbnY7hBe89lnT6zdA7jFicCFvH5d57emc0qjHyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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