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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbfcb6dbc3426361686792530c23d7a212f1c97f92b5b75362bdec4a51c59739' 
  AND token = '6AA43uqIb5HCHzQCKmcE9vymxUKcabX6j0nSXas0cBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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