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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e5f023f9cc64e93166421a52e2f038d168c4bc4b96670672a2c8dac0d89cb7' 
  AND token = 'ynnkhIGbg4drQt+EEv4YQDJBieczWtujqe73jvyb8Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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