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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08296d5664ac9d23e74cf87d3a5a5ae9a4e185262003675c797c27e8cf01f5d' 
  AND token = 'hs8u9MK9YCNx9rPzRqZA26LCGHINe8D3wFddw4BVumY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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