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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be3f909a296b98c7bbc03377452ba97fa98009b856efb6eae06264e3479de9e2' 
  AND token = 'd+COHQ3UzQzuC5s3UNRQ+bXVR2lD1udPaC5sEV1Cv+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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