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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0afb62b9c3b739afe83bbf9619cc4be47e1b3c95019283e6656a77442ef5f83e' 
  AND token = '317SlPuDkRwSq1QjHgX8wnL0p8LZ9AxWc4OcF5d2SgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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