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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d56ee88b17eea82194312544a03ab08aec96ef9c897d6ef745f1fd6158b5878' 
  AND token = 'VlF1jNazmh4Ct5npUplBqyAIR9ZcwOOkyKueC1FFwZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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