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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc27e4a97282dcd2ca09f69c0c87d0440afe0282fd2fc0d2659be38108d8959' 
  AND token = 'RiGis9vNd8AU8Ebh+o5UjqxqDQYbiXQljbMYcw/SgE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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