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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ffce3d2620367f94a26ee9bbf1433580a3fcb5a9d94a15ec11e1d334ab91f7a' 
  AND token = '9rZ8V4XLtjTqoofBqmr245OA5kdCMIowwDv46zwt6TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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