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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cedce55adf9645ac4e9c78cf2cb5e44d246dd9f0242f675ff9e3c5374a5cc12f' 
  AND token = 'PtaZ6HPgIPcLQptuCfXOeQoAYUo7jsHqESJj5h+mAt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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