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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91f1a337bedce77f8e98c23f62f112870e63f2aa71850687658fb7f5449f186e' 
  AND token = 'T6XDFYvTmrFwTy2mCum8ehf6seAbrIjURalRFJWpXs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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