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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ad988e3c7bc2acaae5f7814546cd40dbc7588f92679ea018c9c56ed4e90dc4' 
  AND token = '3b3fLZvw6VAkOElJOP3ccgZZvk2EG2KAHQER8K7LEPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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