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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60959825f54927348f5bdb2bb373c84c9d0616331da3fd29d571dae8d94ca80f' 
  AND token = '40sqwWyRagA7Bhp4fL9ROdav39/NTzXuHbpfurV8bq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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