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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea9cd09cb8a1d5d6f0f1933917738bde29ee3bedebb74993d17383315bb27da' 
  AND token = 'I2A98gbRvboWh29TZ8VnwhGB5udNXm01Ib1QYdFMZFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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