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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26429f8d571f631286bf7a1ed736f707b3bb492932dacebd47346698dce1bd4' 
  AND token = 'd7U+faXoJHr+J8FsjBR1to2uFivq8pbiZfUF6tjErqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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