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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b07c360ffa7b77a8fa543f6b5eb88b09c0dce13e6674bacf783e361b6b8ec3c' 
  AND token = '6tunUo+4P+UssrVTk3/KXIduY+WvsqjLi5vVZLbLnco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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