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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd760be95eda2126909b3e6f33d3d40bfb7afcb80ee68ba44abd2184644e1757a' 
  AND token = 'lhz5/ALgm4JaiXklFDary2sCa5cF7IEq/kJgBqRUfWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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