SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc7d65184a3f317c8d33b5221d1541a57d5877f6aa253c478b83b21bfdc815e' 
  AND token = 'ozqDLrmlYXvHoMuNGsuj1UYmdGdjubJJfviZ/p7gh0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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