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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf30957d2ff232ea556c505588cdb008935d1f66c4f4d590731920782d60b842' 
  AND token = 'O7lMYofQeoDbwDuco2YuLs9Zk0j1w6L94PO8+9BW6UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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