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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '805beddc61d6e9b474c697134f1e0d918a60fa6914cd92df1f0b9ccc4e13a5be' 
  AND token = 'saMYkJ8zS0cKOeBP9mPQU4V0M2djlCDTs5RZgdM3w0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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