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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2ff3aeeed3002febd683b5ef104a7d29bac29eb52814833fedf671aa91cd9e' 
  AND token = '28j7LNQEYjmPOLieKoE5ykYjVaoN51jmIGZNJi7eexw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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