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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c256534740eec58f5c18609283d4aa96eb0ed6296b5fdd7b034f3f86b65188e0' 
  AND token = 'Y7Ud3gXCI081sqLYSb23PHAxqPrYmTApOtVkbxTOjXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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