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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02dd58fdc764a52df211aef095455a58c7f5b50117a3b8ae3f24e6a812a6a18c' 
  AND token = 'oullOyybHpdoluwfd9N0WZeylnYO51YMVkPX9fcjs+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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