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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '911b4ce66100afbff1cee5e75153ba34c5a8bef471abdd341a4c363dd05dab77' 
  AND token = 'AQl27C7x+dOkhlvcxJvkVbmMVDdozGGmZoEJmd8jq/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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