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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08720405351a83348b5686d81cd1ea15a4d4fd9b119e3bc3cac2dce99552b39' 
  AND token = '2ghoXXbO5BbPxqurG4w4iQsmXHgnhH5p8ttrlaNLbFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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