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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99310f7707deba89a64630f85c1de2c2fe443a2d477d79e0e3f28f1d2da3ac2' 
  AND token = '7LF2pYjrvKGZEx+0YVA9G2LYoi4LHgMI0v+0Pdt6m+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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