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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b20ac67f86d8a9470f2c0ed28f4cfc50ededf9493ddc5e69d9a216e04d5f15b' 
  AND token = 'fpvZ+hyt27m4t7lpVrrYt2oKM7Ku6yLNWgEH1aINkjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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