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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad305a6dfc177025fa8133e4470c77c3baa3429c659511476d94f04eb5bc770' 
  AND token = 'eli9UHDOd/DO/57eH0hi6eRILNxNsFBpVaqr5sY0qKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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