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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '358e75c9b08fc8442363d3bf54be9de184904ae94cd4eae4a263bf5e239181b8' 
  AND token = 'JFY3lktlHFyBPTcZKfz8DQ/67S1cZSjFV/Y6oxHEX1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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