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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a71d6ebe53d3b868b16a40c9398102a1743b04cd97fbbf29f41fbae8ad0c45d' 
  AND token = 'z/7av1AbmWj/qARN3GVb6MSx2fECmatg6KxEqqGSFaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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