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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23678323f2a7c55c7108253b3ce9bde8b505606dd25438084f34ce8264a39d79' 
  AND token = 'Cdrcdjo/G9vc2Lr3EkT7I0uC8mjqa/S29T+Jfesy4hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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