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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee4a4614823f587b131811565bdeff2015e7429f9dd74a9560d44e42060d388' 
  AND token = 'Z0PUSC1FEt1h09WYMt94qiHBjgZAoBAXH3cuO9H+C1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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