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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ee654037d318a3da49456d789855906a9298003cc6f6caf26d792a3f72c4e5' 
  AND token = '+qS9qiSsNJJlQ+cxpVCrJfWzcNWqJqZ7GrXcUyNGZMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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