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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7fdcc8a54b69d07a9d406b340f2ff9fb5258926bc4b5e469f1a746bd3fc91ff' 
  AND token = 'PNaLCQh4s8pTgofrZO/zBd0Zsak+RDUQv2uIFbJ3tNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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