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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '825dba208e3abfe9994d84c5b899f72b172713e5754c4bdd14e801f6885c6b1e' 
  AND token = 'lK0EhUVwQmD6d9l7W1YP7vlBGk2PcDWfgmoyh0x/k5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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