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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2df0ad267cc22b10960c850834477577e3532ce0ccd87b3857c806b1ba9194c5' 
  AND token = 'bXSV/fmMo2hVmFVV8157ubWYF5nO9u6IhfraqORr8Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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