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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a792ed3904dc9ef3c4c790d31e1b75268cc550f16b2ab1c1efd697ad0e69c524' 
  AND token = 'rfOU86E/W6MqeV8o85+Ezi2wIofF2kzNqIRlfQGdyWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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