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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39ac003eedc8af1a5a4ae0822b36a6e55ce7f7815605522b263fb9f90c2003e' 
  AND token = 'c3U0D8HeKmZapABKFvsUWunP3yiLLcj3yIEuXuQGXs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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