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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b839a4d26896e5f7115bec7198615bce149331c94964864297ce55ce1ed2c59' 
  AND token = 'TLJdgRwiQPXaVeN2j4zx+S1mmCkV4Ef8QLiICtF0evM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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