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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc387fe11a5ef4ed14b6dacde34a1451884fcbf19a4f5b113822173247a4d94' 
  AND token = 'ojItR765m0LBYZDkYrkgyxefUMcIHLBVZYszRHw3+cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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