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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '577d0bb3f9fc8dd6f1315e387a904c813fc6c4907bb6c2424bd59ae4d1f3bdb3' 
  AND token = '2lGBtuFzCLcIyfsGYe9gCFEcid7tf3GDGuduK9vgR5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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