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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2815bc83fc4ae89807348995988e4da359dee1c92ac064e7cb7cb17022dfa501' 
  AND token = 'l2yIc6+37vGOxhO9UMsOaMdO8xiFq0X7rqrmnWJx9gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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