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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf769b4a40d64633c2e3f64a304a3bdbeb160cd223631c7a65d8a60739d38142' 
  AND token = 'gKV2IAy7zrHVcfTcXB1YuI1cgOAuUJAL1VL+WPvlkPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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