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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd886d71f5e98b8ea2294835ac26bb5e2821c1b9e0eadd7ff887082b35b7416f8' 
  AND token = 'aY9cGHdmN2SWBymhew46QuNWtR2lw7hcwZci0TrQJTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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