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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '689654568d3e388764e15fb6199e25a1918844189f2845ec1f5667301d971045' 
  AND token = '0cGJeyJljmIzNdqFVEV4qvrV1aPvtq9F3xv8nrXpZJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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