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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7149804a06247ac424a0a09040a5a2fd327a0deb4e369058c4ec60bd20061a14' 
  AND token = 'thEUkD1P0jAS36Zm7p8BLNeN+PJmawEgV3EDCInMHoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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