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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c770fad5bdab3b3051bb416643909ec0144e5f825ed4774afa11c15a745d38e9' 
  AND token = 'HXEtlZD+atkM0HaxEBNMaI/lqYIEVxOSGHCVE23e2ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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