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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f04e7031605f7e5f0c4aba60eb2addb2f07b66cffdb104b1bb81dbf04282c6e3' 
  AND token = 'g5UGhns0P5x+BKockRQkzkj7TS1RmM5Pq3WUZAU774M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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