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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5f74c49bda584d9a6711b936e538bad4de539c108fd53fc53fbcae9449df32' 
  AND token = 'NvOgITs2/BdhI9wdnPW2zNZebOVag84k+/CYMm0bEQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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