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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bace019a0ddf8a075f2d4ea804c0178ffca3c0727fe84da31b7672a0a300144d' 
  AND token = 'iWdQzcgtGztDYrmU3Uyl0zkKKXnZRdsoLDPEJtJ3GJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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