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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '263e8cebf3cdb43ff4483ef140ccb0f63e44b548827311944a977fe43ffa2711' 
  AND token = 'sxMKW1IZ1v1xfyxb9mv2Ql6XRH3Zl75bPa+J/wJ0N1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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