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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d3f7bcc5c8e616340bb3e14011300a105de560ae748c59e38daf4dae14a535' 
  AND token = 'fbSU471mmAb71ofdq8h73LR+GhKdjWEFuGeB8BFWeIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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