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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06389df5ff0d38074f97949af1f4793dbce00b6be0799a0ec6996a5d354b41e6' 
  AND token = 'BjkHUBp6WuvDpeN9aZEdxX4CcpFxNeWlMuYPZlG2mWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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