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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1c4ca5624a5057debd268089c562049b06101a7f13a95a041d4e2d498003fbd' 
  AND token = 'kBRl8BLme3SI1mKrInwLUlGRsAkF8BjlfUXPMxOrNxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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