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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84a43ebb6897b7c321cd4b881dc21980e0d6bb4471e2a238ce24136601d48b0' 
  AND token = 'lt77E6qg2yASftu4/bG2Vkb2UvBaTB+stksg9uUM6Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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