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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e24012416bd10cc2caa932db8eed5abbc2684654281cf41ecdf48c0f3d0c15e2' 
  AND token = 'aTDaQ/JpI17L8JjQHRBxv40aE9lEG3KsLf0Nodvrlu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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