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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be11b4dfa10421d0c712abf5b49615f19135df2c52c840b9ddcc0361250b1ed3' 
  AND token = 'qnQ8Rf00WItMM14O18xrlUs92M6l1nXjU8/ieQW+4V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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