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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa65d0d1b7d76c3bded93a6584f727b9879822efa075e2e702f823e3fd8d14e' 
  AND token = '1H6Tfif6tNdYyb1lCjj8TWqcfou1gBsOP7GSzyae2Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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